• 1. SMC manhole cover is non-metallic, non-conductive and non-sparking. It has no value of recycling, thus completely solving the problems caused by theft;
• 2. Multi-load capacity, wide application. load ability:25ton. 50% higher tensile strength than hot rolled steel and better impact resistance;
• 3. Superior durability to Stainless Steel, Aluminum, and Galvanized Gratings, especially in highly corrosive environments. Long service life(min 30 years);
• 4. Nice appearance .Outstanding dying, rich colors; the cover is not sprayed in surface but painted in whole material so that the color can keep lasted; With clean, smooth surface,  it will be consistent with the lawn or ground, beautiful and functional;
• 5.Light weight of composite manhole cover especially SMC manhole cover is lighter. The composite manhole cover is more convenient to transport, install and repair.

Hot and cold resistance>>

Put the sample into oven under 60 degrees for 16 hours, and then put the same sample in - 40 degrees cold box for 2 hours: inflation rate of 0.2% max, shrinkage 0.09% max.

Corrosion resistance>>

Under normal temperature, immerse the sample well cover in corrosive medium for 2 hours: no crack, or expansion, the surface didn't get pale.

Friction coefficient>>

Friction for 5 hours between well cover and rubber , its coefficient > 0.35

Ageing resistance>>

Place the sample into temperature and wet adjustable device, with 60 °C ± 5 °C for xenon lamp and rain test for 500 hours, its flexural strength change: > 3

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